Tic Tac Toe TEAM 1
1. Using the letter “b” show a genotype of a hybrid offspring with incomplete dominance. (B B’)
2. What is the purpose of Meiosis?
(to create sex cells)
3. During crossing over, what is occurring? (homologous chromosomes exchange genes during meiosis)
4. What is a phenotype? (the physical aspect of a trait- what you see)
5. Explain the chromosome set up inside a haploid cell. (There is one of each type of autosome and one sex
chromosome)
6. Explain the Law of Segregation?
(When sex cells are made, the two alleles for a trait separate and only one is passed down per sex cell.)
7. What is the specific end result of Mitosis? (two identical diploid cells)
8. What is a zygote? (The first diploid cell created after fertilization)
9. If a female that is a carrier for colorblindness is crossed with a colorblind male, what are the chances their child will
be colorblind? (50%)
10. What are the only non-homologous chromosomes? (the sex chromosomes for a male, XY)
11. Why is it easier for a male to express a recessive phenotype if it is X-linked? (because he only has one X)
12. What are autosomes? (The first 22 pair of homologous chromosomes)
13. What is the difference between a sex cell and a sex chromosome? (a sex cell is a haploid cell that contains 23
chromosomes….a sex chromosome is the X and Y that make up the 23rd pair of chromosomes)
14. If you are tracing a recessive allele in a pedigree. And you have a mom and dad that do not show the trait, but
they have a daughter that does. What are the parent’s genotypes and why? (They are both heterozygous because
they both have to pass down the recessive to their offspring)
15. Why can you not see a point or frameshift mutation on a karyotype? (because you aren’t reading the DNA, just
looking at the number or chromosomes and chromosome structure)
16. If a parent is Heterozygous for two traits- as in a dihybrid, what would the combinations be in it’s gametes? Use
the letters “T” and “B” (TB, Tb, tB, tb)
17. What is polygenic inheritance? (when one trait is governed by many genes, and there is a variety of phenotypes)
18. Define Co-Dominance. (When two alleles in a genotype are dominant, code for two different things, and are
expressed equally in the phenotype)
Tic Tac Toe TEAM 2
1. Cross a male parent with AB blood and a female parent with heterozygous B blood. What is the
phenotypic ratio. (1:2:1…….in other words, one has AB, two have B, one has A)
2. What kind of cells do Mitosis and Meiosis start with?
(a diploid cell)
3. Why does crossing over occur? (to create a variety in the alleles within the gametes- genetic recombination)
4. What is a genotype? (the genetic combination of two alleles for a trait, for instance Tt)
5. The name for various forms of a gene? (alleles)
6. Explain the Law of Independent Assortment. (Each trait is inherited independently of each other)
7. What is the end result of Meiosis? (four haploid cells, not identical)
8. Explain what homologous chromosomes are (two chromosomes in a pair, one from mom one from dad, that share
the same genes)
9. Explain Non-disjunction. (when homologous chromosomes do not separate properly during meiosis)
10. What is a karyotype used for? (to see abnormalities in chromosome shape or number of chromosomes, also to
determine gender)
11. What is the relationship between alleles and traits? (two alleles together determine a organism’s trait)
12. In Co-Dominance, if you crossed a White Flower with a Red Flower, what would be the phenotypic result of the
offspring? (Red and White flowers)
13. If you cross XRXR with XrY, what kind of inheritance is this? (Sex-linked)
14. Without making a punnett, if you crossed RRyy with rrYY, how many different genotypes would be possible in
offspring? (only 1: RrYy)
15. Explain the relationship between haploids, fertilization, zygotes, and diploids. (two haploids unit during
fertilization to create the first diploid cell of an organism, which is a zygote)
16. Every three letters on an mRNA strand is called ….? (a codon)
17. What inheritance involves one trait that is governed by more than two alleles, like blood types? (Multiple Alleles)
18. Define Incomplete Dominance. (When there are two alleles for a trait, both are dominant, and one codes for
Nothing, so the phenotype only codes for half of an allele)